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Note that only the Fix Version/s field is used for tests. All tests that have a Fix Version populated will be organized accordingly. If that field is left blank, then they will belong to an "Unscheduled" version. See Organize Tests for more details.
Creating a new test issue from another issue type:
For a supported issue type, select the More drop-down and then select Create Zephyr Test.
Tests created this way will automatically be linked back to the issue they were created from.